Rubber-like elastic part

ABSTRACT

In order to make it possible to previously specify which of two members the rubber-like elastic part pinched between the two members attaches to, and to improve workability of rework or the like, an attachment member specifying structure is provided in the rubber-like elastic part so that the rubber-like elastic part is surely detached from one member and attached to the other member at a time of moving the two members apart from each other, preferably by forming a contact area with one member in the rubber-like elastic part smaller than a contact area with the other member, by forming a surface treated portion by matte finishing or the like in a contact area with one member in the rubber-like elastic part, or by forming a projection-like spring portion elastically pressed to one member so as to achieve a spring effect.

TECHNICAL FIELD

The present invention relates to a rubber-like elastic part used so asto be pinched between two members opposed to each other without usingany adhesive agent. The rubber-like elastic part in accordance with thepresent invention is employed, for example, as a gasket for sealingbetween two members or a damping rubber for inhibiting a vibration frombeing propagated between two members. Further, the rubber-like elasticpart in accordance with the present invention is also employed as arubber-like elastic part for a hard disc apparatus (HDD), and isemployed, for example, as a connector gasket for HDD, a voice coil motor(VCM) damper for HDD or the like.

BACKGROUND ART

For example, in the HDD, a gasket constituted by an elastic body made ofrubber or resin or the like is mounted to each of a top cover portion (alid portion) and a connector coupling portion, in order to prevent anyforeign material such as a dust, a water content or the like from makingan intrusion into an inner portion thereof.

In this structure, a flat-shaped structure made of a rubber simplesubstance is frequently employed as the connector gasket mounted to theconnector coupling portion, and a double-sided lip-shaped structure inwhich a contact area is reduced while taking an adhesive property of thegasket into consideration is employed as the other gaskets.

The connector gasket is used for sealing a portion which takes out asignal from a head to an outer portion of a casing of the HDD via aflexible circuit (FPC), is generally mounted so as to surround theconnector mounted to the FPC, is pinched between the FPC and a base madeby an aluminum die casting and a cationic coating, and is fastened byscrews or the like, thereby achieving a seal effect.

FIG. 20 shows an example of the connector gasket, in which an FPC 52 ismounted to a predetermined position in an inner portion of a base 51. Astate in which the FPC 52 is detached from the base 51 and is reversedis shown in FIG. 21. In FIG. 21, reference numeral 53 denotes aconnector mounted to a center of a flat surface of the FPC 52. Aconnector gasket 54 sealing between the base 51 and the FPC 52 ismounted around the connector 53.

In this case, in a manufacturing process of the HDD, the HDD ismanufactured by repeating an assembling, an inspection and a rework suchas actuating the HDD and executing the inspection after assembling, andexecuting the rework frequently on the basis of the inspection result.Accordingly, a workability at a time of reworking is especiallyimportant.

However, in conventional, since the gasket 54 is firmly fixed to thebase 51 and the FPC 52 due to an adhesive property of the gasket 54,there is generated a problem of deterioration in workability, that is,the once mounted FPC 52 can not be easily detached from the base 51.This is because the gasket 54 is adhered to the opposing member (thebase 51 and the FPC 52), due to a temperature rise caused by theactuation of the HDD.

Further, since it is uncertain whether the gasket 54 is attached to aside of the base 51 or a side of the FPC 52, at a time of detaching theFPC 52 from the base 51, it is impossible to stabilize a workingprocedure at a time of reworking. In particular, in the case that thegasket 54 is attached to the side of the FPC 52, it is necessary toexecute a work of peeling the gasket 54 from the base 51 one by one soas to attach to the side of the FPC 52 at a time of remounting the FPC52 to the base 51. Further, accompanying therewith, it is necessary tocheck which of the FPC 52 and the base 51 the gasket 54 is attached to,with respect to all of the gaskets at a time of reworking. In order tosurely attach the gasket 54 to any one of the FPC 52 and the base 51,there is a method to attach the gasket 54 by applying an adhesive agentto one surface of the gasket 54, however, in the case of the HDD, an outgas generated from the adhesive agent causes an improper operation.

The present invention is made by taking the points mentioned above intoconsideration, and an object of the present invention is to provide arubber-like elastic part used so as to be pinched between two membersopposed to each other without using any adhesive agent, in which it ispossible to previously specify which of two members the rubber-likeelastic part is attached, whereby it is possible to improve aworkability of a rework or the like.

DISCLOSURE OF THE INVENTION

In order to achieve the object mentioned above, in accordance with afirst aspect of the present invention, there is provided a rubber-likeelastic part used so as to be pinched between two members opposed toeach other without using any adhesive agent, wherein an attachmentmember specifying structure is provided in such a manner that therubber-like elastic part is surely detached from one member and attachedto the other member at a time of detaching the two member.

Further, in accordance with a second aspect of the present invention,there is provided a rubber-like elastic part used so as to be pinchedbetween two members opposed to each other without using any adhesiveagent, wherein a contact area with one member in the rubber-like elasticpart is formed smaller than a contact area with the other member in sucha manner that the rubber-like elastic part is surely detached from theone member and attached to the other member at a time of detaching thetwo member.

Further, in accordance with a third aspect of the present invention,there is provided a rubber-like elastic part used so as to be pinchedbetween two members opposed to each other without using any adhesiveagent, wherein a surface treated portion formed by matte finishing orthe like is provided in a contact area with one member in therubber-like elastic part in such a manner that the rubber-like elasticpart is surely detached from the one member and attached to the othermember at a time of detaching the two member.

Further, in accordance with a fourth aspect of the present invention,there is provided a rubber-like elastic part used so as to be pinchedbetween two members opposed to each other without using any adhesiveagent, wherein a projection-like spring portion elastically pressed toone member so as to achieve a spring effect is provided in such a mannerthat the rubber-like elastic part is surely detached from the one memberand attached to the other member at a time of detaching the two member.

Further, in accordance with a fifth aspect of the present invention,there is provided a rubber-like elastic part as described in any one ofthe first to fourth aspects mentioned above, wherein a surface treatedportion such as matte finishing or the like, or a detachmentfacilitating portion constituted by a concavity and convexity or thelike is provided in a contact surface with the other member in a lugportion of the rubber-like elastic member in such a manner as to easilypeel the rubber-like elastic part from the other member.

Further, in accordance with a sixth aspect of the present invention,there is provided a rubber-like elastic part as described in any one ofthe first to fifth aspects mentioned above, wherein the rubber-likeelastic part is constituted to be a gasket or a gasket for HDD.

Further, in accordance with a seventh aspect of the present invention,there is provided a rubber-like elastic part as described in any one ofthe first to fifth aspects mentioned above, wherein the rubber-likeelastic part is constituted to be a damping rubber or a damping rubberfor HDD.

Further, in accordance with an eighth aspect of the present invention,there is provided a rubber-like elastic part as described in any one ofthe first to fifth aspects mentioned above, wherein the rubber-likeelastic part is constituted to be a rubber-like elastic part for HDD.

In the rubber-like elastic part in accordance with the first aspect ofthe present invention provided with the structure mentioned above, sincethe attachment member specifying structure is provided in therubber-like elastic part in such a manner that the rubber-like elasticpart is surely detached from one member and attached to the othermember, the rubber-like elastic part is surely detached from one memberand attached to the other member, whereby it is possible to specify themember to be attached.

As specified examples of the attachment member specifying structure, itis preferable to form the contact area with one member in therubber-like elastic part smaller than the contact area with the othermember, as described in the second aspect, to form the surface treatedportion formed by the matte finishing or the like in the contact areawith one member in the rubber-like elastic part, as described in thethird aspect, and to form the projection-like spring portion elasticallypressed to one member so as to achieve the spring effect as described inthe forth aspect.

Further, in addition to them, as in the rubber-like elastic part inaccordance with the fifth aspect of the present invention provided withthe structure mentioned above, in the case that the surface treatedportion such as the matte finishing or the like, or the detachmentfacilitating portion constituted by the concavity and convexity or thelike is provided in the contact surface with the other member in the lugportion of the rubber-like elastic member, the peeling work can beeasily executed at a time of peeling the rubber-like elastic part in astate of being attached to the other member from the other member.

The rubber-like elastic part in accordance with the present invention isconstituted, for example, to be the gasket or the gasket for HDD (thesixth aspect), the damping rubber or the damping rubber for HDD (theseventh aspect), and the rubber-like elastic part for HDD (the eighthaspect). However, with respect to the structure relevant to the HDD,since no adhesive agent is used at a time of attaching, there is noproblem of the improper operation caused by the out gas generation.

In this case, the following technical matters are included in thepresent application.

In other words, in order to achieve the object mentioned above, therubber-like elastic part proposed by the present application is providedwith the following contents.

(1) A single-sided adhesive property and a single-sided non-adhesiveproperty are provided by making a contact area in a side requiring anon-adhesive property smaller than that in a side requiring an adhesiveproperty.

The elastic body such as the rubber or the resin or the like has adifferent adhesive property which is individual in each of thematerials, and a detachment load is dependent on the adhesive propertyand the contact area of the elastic body. Accordingly, in the case thatthe contact area is small as in a lip shape, the detachment load becomessmall, and in the case that the contact area is made large such as in aflat shape, the detachment load becomes large. Therefore, thesingle-sided adhesive property and the single-sided non-adhesiveproperty can be provided by making the contact area in the siderequiring the non-adhesive property smaller than that in the siderequiring the adhesive property.

(2) The single-side adhesive property and the single-sided non-adhesiveproperty are provided by applying a surface treatment such as mattefinishing or the like only to the side requiring non-adhesive property.

The contact area can be differentiated between the side requiring theadhesive property and the side requiring the non-adhesive property, andthe single-sided adhesive property and the single-sided non-adhesiveproperty can be provided, by applying the surface treatment such as thematte finishing or the like only to the side requiring the non-adhesiveproperty.

(3) A detachment is facilitated by forming a projection portion aimingat a spring effect in a side requiring a non-adhesive property.

The gasket is provided with the projection aiming at the spring effectin addition to the lip or the projection portion having the gasketfunction. In this case, a collapsing margin of the projection portion isset larger than a collapsing margin of the lip or the projection portionin the side requiring the non-adhesive property. It is possible to liftup the gasket on the basis of a repulsion force in the projection, togenerate a force in a direction of peeling the firmly fixed contactportion, and to facilitate the detachment.

(4) A convexity and concavity is provided only in the lug portion, whilethe whole is formed in a flat shape, in the side requiring adhesiveproperty so as to give an adhesive property and to facilitate thedetachment at a time of requiring the detachment.

The connector gasket can be provided with a lug portion in addition to asealing functioning portion with taking into consideration a workabilityat a time of positioning and mounting. In the case that it is intendedto detach the firmly fixed gasket in the side requiring the adhesiveproperty, the contact area can be reduced and the adhesive property canbe lowered by forming the concavity and convexity or the surfacetreatment such as the matte finishing or the like for reducing thecontact area only in the lug portion so as to facilitate the detachment.It is possible to detach in a shearing direction by peeling from the lugportion, and it is easy to detach.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a plan view of a gasket in accordance with a first embodimentof the present invention;

FIG. 2 is an enlarged cross sectional view along a line A-A in FIG. 1;

FIGS. 3A, 3B, 3C and 3D are cross sectional views showing other examplesof a gasket cross sectional shape;

FIGS. 4A, 4B, 4C and 4D are cross sectional views showing other examplesof the gasket cross sectional shape;

FIGS. 5A, 5B and 5C are detailed views of the gasket having the crosssectional shape shown in FIG. 4C, in which FIG. 5A is a plan view, FIG.5B is a cross sectional view along a line B-B in FIG. 5A, and FIG. 5C isa view as seen from a direction of an arrow C in FIG. 5A;

FIG. 6 is a detailed bottom view of the gasket having the crosssectional shape shown in FIG. 4C;

FIG. 7 is a cross sectional view of a gasket in accordance with a secondembodiment of the present invention;

FIG. 8 is a cross sectional view showing another embodiment of the crosssectional shape of the gasket;

FIG. 9 is a cross sectional view of a gasket in accordance with a thirdembodiment of the present invention;

FIG. 10 is a schematic view relating to a magnitude of a collapsingmargin;

FIG. 11 is a schematic view relating to the magnitude of a collapsingmargin;

FIG. 12 is a cross sectional view showing another example of the crosssectional shape of the gasket;

FIG. 13 is a cross sectional view showing another example of the crosssectional shape of the gasket;

FIG. 14 is a cross sectional view showing another example of the crosssectional shape of the gasket;

FIGS. 15A, 15B and 15C are views showing a gasket in accordance with afourth embodiment of the present invention, in which FIG. 15A is a planview, FIG. 15B is a cross sectional view along a line D-D in FIG. 15A,and FIG. 15C is a cross sectional view along a line E-E in FIG. 15A;

FIGS. 16A and 16B are views showing the gasket in accordance with thefourth embodiment of the present invention, in which FIG. 16A is abottom view, and FIG. 16B is a view as seen from a direction of an arrowF in FIG. 16A;

FIG. 17 is a perspective view showing an attached state of a VCM damperin accordance with a fifth embodiment of the present invention;

FIG. 18 is a cross sectional view showing the attached state of the VCMdamper;

FIG. 19 is a perspective view showing another example of the VCM damper;

FIG. 20 is a schematic view of an HDD; and

FIG. 21 is a schematic view of an FPC, a connector and a gasket.

BEST MODE FOR CARRYING OUT THE INVENTION

Next, a description will be given of embodiments in accordance with thepresent invention with reference to the accompanying drawings.

First Embodiment

FIG. 1 shows a flat surface of a gasket 1 corresponding to a rubber-likeelastic part in accordance with a first embodiment of the presentinvention, and an enlarged cross section (a cutoff end surface) along aline A-A thereof is shown in FIG. 2.

The gasket 1 in accordance with the embodiment is mounted around aconnector in the HDD as shown in FIGS. 20 and 21 mentioned above, sealsbetween a base corresponding to one member and an FPC corresponding tothe other member, and is structured as follows.

In other words, an endless-shaped gasket main body 2 surrounding acircumference of the connector is provided by a rubber-like elastic bodymade of a predetermined rubber or a resin or the like, and a lug portion3 is integrally formed at one position on a circumference of an outerperipheral surface of the gasket main body 2.

The gasket main body 2 is structured such that a lip portion 5 having atriangular cross sectional shape or an approximately triangular crosssectional shape (in which a leading end contact surface 6 is formed in around surface shape having a circular arc cross sectional shape) isintegrally formed on one surface of a base portion 4 having arectangular cross sectional shape or an approximately rectangular crosssectional shape (in which a leading end contact surface 7 is formed in aflat surface shape), as shown in FIG. 2. An attachment member specifyingstructure is provided in such a manner that the gasket 1 is surelydetached from the base so as to be attached to a side of the FPC at atime of detaching the base and the FPC from each other. The attachmentmember specifying structure is concretely structured such that a contactwidth w1 of the contact surface 6 in the side of the lip portion 5 withrespect to the base is formed smaller than a contact width w2 of thecontact surface 7 in the side of the base portion 4 with respect to theFPC, and a contact area of the contact surface 6 in the side of the lipportion 5 with respect to the base is formed smaller than a contact areaof the contact surface 7 in the side of the base portion 4 with respectto the FPC. Accordingly, the gasket 1 is surely detached from the baseso as to be attached to the side of the FPC, on the basis of differenceof an adhesive force caused by difference of the contact width or thecontact area between both the contact surfaces 6 and 7.

The cross sectional shape of the gasket 1 is not particularly limited,but may be constituted, for example, in the following shapes.

(1) As shown in FIG. 3A, the cross sectional shape of the gasket mainbody 2 is formed in a trapezoidal shape or an approximately trapezoidalshape. The narrow contact surface 6 with respect to the base and thewide contact surface 7 with respect to the FPC are both formed in a flatsurface shape.

(2) As shown in FIG. 3B, the cross sectional shape of the gasket mainbody 2 is formed in a triangular shape or an approximately triangularshape. The narrow contact surface 6 with respect to the base is formedin a round surface shape having a circular arc cross sectional shape,and the wide contact surface 7 with respect to the FPC is formed in aflat surface shape.

(3) As shown in FIG. 3C, the cross sectional shape of the gasket mainbody 2 is formed in a shape obtained by integrally forming the lipportion 5 having a trapezoidal cross sectional shape or an approximatelytrapezoidal cross sectional shape on one surface of the base portion 4having a rectangular cross sectional shape or an approximatelyrectangular cross sectional shape. The narrow contact surface 6 in theside of the lip portion 5 with respect to the base and the wide contactsurface 7 in the side of the base portion 4 with respect to the FPC areboth formed in a flat surface shape.

(4) As shown in FIG. 3D, the cross sectional shape of the gasket mainbody 2 is formed in a shape obtained by integrally forming the lipportion 5 having a triangular cross sectional shape or an approximatelytriangular cross sectional shape on one surface of the base portion 4having the triangular cross sectional shape or the approximatelytriangular cross sectional shape. The narrow contact surface 6 in theside of the lip portion 5 with respect to the base and the wide contactsurface 7 in the side of the base portion 4 with respect to the FPC areboth formed in a round surface shape having a circular arc crosssectional shape.

(5) As shown in FIG. 4A, the cross sectional shape of the gasket mainbody 2 is formed in a shape obtained by integrally forming the lipportion 5 having a triangular cross sectional shape or an approximatelytriangular cross sectional shape on a center of one surface of the baseportion 4 having a rectangular cross sectional shape or an approximatelyrectangular cross sectional shape, and integrally forming second lipportions 8 having a triangular cross sectional shape or an approximatelytriangular cross sectional shape on both end portions of the othersurface of the base portion 4. A contact width w2 of the contactsurfaces 7 in the side of the second lip portions 8 with respect to theFPC is constituted by a sum of contact widths w3 and w4 of two secondlip portions 8 (w2=w3+w4), a contact width w1 of the contact surface 6in the side of the lip portion 5 with respect to the base is formedsmaller than the contact width w2 of the contact surfaces 7 in the sideof the second lip portions 8 with respect to the FPC, and the contactarea of the contact surface 6 in the side of the lip portion 5 withrespect to the base is formed smaller than the contact area of thecontact surfaces 7 in the side of the second lip portions 8 with respectto the FPC. Further, the contact surface 6 in the side of the lipportion 5 with respect to the base and the contact surfaces (therespective lip leading ends) 7 in the side of the second lip portions 8with respect to the FPC are both formed in a round surface shape havinga circular arc cross sectional shape.

(6) As shown in FIG. 4B, the cross sectional shape of the gasket mainbody 2 is formed in a shape obtained by integrally forming the lipportions 5 having a trapezoidal cross sectional shape or anapproximately trapezoidal cross sectional shape in both end portions ofone surface of the base portion 4 having a rectangular cross sectionalshape or an approximately rectangular cross sectional shape. The contactwidth w1 of the contact surfaces 6 in the side of the lip portions 5with respect to the base is constituted by a sum of contact widths w5and w6 of two lip portions 5 (w1=w5+w6) , the contact width w1 of thecontact surfaces 6 in the side of the lip portions 5 with respect to thebase is formed smaller than the contact width w2 of the contact surface7 in the side of the base portion 4 with respect to the FPC, and thecontact area of the contact surfaces 6 in the side of the lip portions 5with respect to the base is formed smaller than the contact area of thecontact surface 7 in the side of the base portion 4 with respect to theFPC. Further, the contact surfaces (the respective lip leading ends) 6in the side of the lip portions 5 with respect to the base and thecontact surface 7 in the side of the base portion 4 with respect to theFPC are both formed in a flat surface shape.

(7) As shown in FIG. 4C, the cross sectional shape of the gasket mainbody 2 is formed in a shape obtained by integrally forming the lipportion 5 having a trapezoidal cross sectional shape or an approximatelytrapezoidal cross sectional shape on one end portion of one surface ofthe base portion 4 having a rectangular cross sectional shape or anapproximately rectangular cross sectional shape. The narrow contactsurface 6 in the side of the lip portion 5 with respect to the base andthe wide contact surface 7 in the side of the base portion 4 withrespect to the FPC are both formed in a flat surface shape. FIGS. 5 and6 show the entire of the gasket 1 provided with the cross section formedin this shape. As illustrated, in the gasket 1, a flange portion 9having a thin plate shape for positioning the gasket 1 with respect tothe connector is integrally formed in an inner peripheral side of thegasket main body 2, in addition to the gasket main body 2 and the lugportion 3.

(8) As shown in FIG. 4D, the cross sectional shape of the gasket mainbody 2 is formed in a shape obtained by integrally forming the lipportion 5 having a semicircular cross sectional shape or anapproximately semicircular cross sectional shape on one end portion ofone surface of the base portion 4 having a rectangular cross sectionalshape or an approximately rectangular cross sectional shape. The narrowcontact surface 6 in the side of the lip portion 5 with respect to thebase is formed in a round surface shape having a circular arc crosssectional shape, and the wide contact surface 7 in the side of the baseportion 4 with respect to the FPC is formed in a flat surface shape.

Second Embodiment

FIG. 7 shows a cross section (a cutoff end surface) of a gasket 1corresponding to a rubber-like elastic part in accordance with a secondembodiment of the present invention.

The gasket 1 in accordance with the embodiment is mounted around aconnector in the HDD as shown in FIGS. 20 and 21 mentioned above, sealsbetween a base corresponding to one member and an FPC corresponding tothe other member, and is structured as follows.

In other words, an endless-shaped gasket main body 2 surrounding acircumference of the connector is provided by a rubber-like elastic bodymade of a predetermined rubber or a resin or the like, and a lug portion(not shown) is integrally formed at one position on a circumference ofthe gasket main body 2.

The gasket main body 2 is structured such that a lip portion 5 having atriangular cross sectional shape or an approximately triangular crosssectional shape (in which a leading end contact surface 6 is formed in around surface shape having a circular arc cross sectional shape) isintegrally formed on one surface of a base portion 4 having arectangular cross sectional shape or an approximately rectangular crosssectional shape (in which a leading end contact surface 7 is formed in aflat surface shape). An attachment member specifying structure isprovided in such a manner that the gasket 1 is surely detached from thebase so as to be attached to a side of the FPC at a time of detachingthe base and the FPC from each other. The attachment member specifyingstructure is concretely structured such that a surface treated portion10 constituted by matte finishing or the like is provided in the contactsurface 6 in the side of the lip portion 5 with respect to the base. Inthe drawing, the surface treated portion 10 is provided in all thesurface except the contact surface 7 in the side of the base portion 4with respect to the FPC. A roughness of the matte finishing is between 3and 20 μm, and preferably between 6 and 10 μm.

Accordingly, in the case that the surface treated portion 10 constitutedby the matte finishing or the like is provided in the contact surface 6in the side of the base, a difference is made in a magnitude of thecontact area between the base side and the FPC side, so that adifference is made in a magnitude of the adhesive force between the baseside and the FPC side accordingly (the base side is small and the FPCside is large). Therefore, the gasket 1 is surely detached from the baseso as to be attached to the side of the FPC.

The cross sectional shape of the gasket 1 is not particularly limited,but may be constituted, for example, in a shape shown in each of FIGS.3A to 3D and 4A to 4D mentioned above. FIG. 8 shows an example thereofin which the cross sectional shape of the gasket main body 2 is formedin a trapezoidal shape or an approximately trapezoidal shape.

Third Embodiment

FIG. 9 shows a cross section (a cutoff end surface) of a gasket 1corresponding to a rubber-like elastic part in accordance with a thirdembodiment of the present invention.

The gasket 1 in accordance with the embodiment is mounted around aconnector in the HDD as shown in FIGS. 20 and 21 mentioned above, sealsbetween a base corresponding to one member and an FPC corresponding tothe other member, and is structured as follows.

In other words, an endless-shaped gasket main body 2 surrounding acircumference of the connector is provided by a rubber-like elastic bodymade of a predetermined rubber or a resin or the like, and a lug portion(not shown) is integrally formed a tone position on a circumference ofthe gasket main body 2.

The gasket main body 2 is structured such that a lip portion 5 having atriangular cross sectional shape or an approximately triangular crosssectional shape (in which a leading end contact surface 6 is formed in around surface shape having a circular arc cross sectional shape) isintegrally formed on one surface of a base portion 4 having arectangular cross sectional shape or an approximately rectangular crosssectional shape (in which a leading end contact surface 7 is formed in aflat surface shape). An attachment member specifying structure isprovided in such a manner that the gasket 1 is surely detached from thebase so as to be attached to a side of the FPC at a time of detachingthe base and the FPC from each other. The attachment member specifyingstructure is concretely is structured such that a projection-like springportion 11 elastically pressed to the base and achieving a spring effectis integrally formed in the gasket main body 4. The spring portion 11 isprovided in the same side as that of the lip portion 5, and is formed ina rectangular cross sectional shape or an approximately rectangularcross sectional shape (in which a leading end surface is formed in aflat surface shape).

Accordingly, in the case that the projection-like spring portion 11achieving the spring effect is provided as mentioned above, the contactsurface 6 in the side of the base is peeled from the base due to itselastic property, or becomes to be easily peeled at least, so that adifference is made in a magnitude of the adhesive force between the baseside and the FPC side accordingly (the base side is small and the FPCside is large). Therefore, the gasket 1 is surely detached from the baseso as to be attached to the side of the FPC.

In this case, in order to achieve the effect mentioned above, it iseffective to set a collapsing margin T1 of the spring portion 11 to belarger than a collapsing margin T2 of the lip portion 5. In the case ofsetting the collapsing margin T1 of the spring portion 11 to be largerthan the collapsing margin T2 of the lip portion 5, a height of thespring portion 11 is generally formed larger than a height of the lipportion 5 due to the flat surface shape of the base portion 12 as shownin FIG. 10. However, in the case that a step 13 or the like is providedin the base 12 as shown in FIG. 11, there is a case that the height ofthe spring portion 11 is formed smaller than the height of the lipportion 5.

The cross sectional shape of the gasket 1 is not particularly limited,and the following shapes may be employed, for example.

(1) As shown in FIG. 12, the cross sectional shape of the lip portion 5is formed in a trapezoidal shape or an approximately trapezoidal shape,and the contact surface 6 in the side of the lip portion 5 with respectto the base is formed in a flat surface shape. Further, in order tosecure the height of the spring portion 11, a step 14 is formed in onesurface of the gasket main body 4.

(2) As shown in FIG. 13, the leading end surface of the spring 11 isformed in a round surface shape having a circular arc cross sectionalshape.

(3) As shown in FIG. 14, the width of the spring portion 11 is formed soas to be gradually smaller from the base end portion toward the leadingend portion. Further, in addition, the leading end surface of the springportion 11 is formed in a round surface shape having a circular arccross sectional shape.

Fourth Embodiment

FIGS. 15A to 15C and 16A to 16B show a gasket 1 corresponding to arubber-like elastic part in accordance with a fourth embodiment of thepresent invention, in which FIG. 15A is a plan view thereof, FIG. 15B isa cross sectional view along a line D-D in FIG. 15A, FIG. 15C is a crosssectional view along a line E-E in FIG. 15A, FIG. 16A is a bottom viewthereof, and FIG. 16B is a view as seen from a direction of an arrow Fin FIG. 16A.

The gasket 1 in accordance with the embodiment is mounted around theconnector in the HDD as shown in FIGS. 20 and 21 mentioned above, sealsbetween the base corresponding to one member and the FPC correspondingto the other member, and is structured as follows.

In other words, an endless-shaped gasket main body 2 surrounding acircumference of the connector is provided by a rubber-like elastic bodymade of a predetermined rubber or a resin or the like, and lug portions3 are integrally formed at two positions on a circumference of an outerperipheral surface of the gasket main body 2. Further, a thin plate-likeflange portion 9 for positioning the gasket 1 with respect to theconnector is integrally formed in an inner peripheral surface of thegasket main body 2, and ring-shaped rib portions 15 for positioning thegasket 1 with respect to the base are integrally formed within a flatsurface of the flange portion 9.

The gasket main body 2 is structured, as well shown in FIG. 15C, suchthat a lip portion 5 having a triangular cross sectional shape or anapproximately triangular cross sectional shape (in which a leading endcontact surface 6 is formed in a round surface shape having a circulararc cross sectional shape) is integrally formed on an outer peripheraledge portion of one surface of a base portion 4 having a rectangularcross sectional shape or an approximately rectangular cross sectionalshape (in which a leading end contact surface 7 is formed in a flatsurface shape). An attachment member specifying structure is provided insuch a manner that the gasket 1 is surely detached from the base so asto be attached to a side of the FPC at a time of detaching the base andthe FPC from each other. The attachment member specifying structure isconcretely structured, in the same manner as the first embodimentmentioned above, such that the contact width of the contact surface 6 inthe side of the lip portion 5 with respect to the base is formed smallerthan the contact width of the contact surface 7 in the side of the baseportion 4 with respect to the FPC, and the contact area of the contactsurface 6 in the side of the lip portion 5 with respect to the base isformed smaller than the contact area of the contact surface 7 in theside of the base portion 4 with respect to the FPC. Accordingly, thegasket 1 is surely detached from the base and attached to the FPC sideon the basis of the difference of the adhesive force caused by thedifference of the contact width or the contact area between both thecontact surfaces 6 and 7.

The lug portion 3 is provided as a tab for preventing the gasket 1 frombeing erroneously assembled between inside and out. In other words, agroove (a recess portion) attaching the connector is provided in thebase, and in the case that the gasket 1 is assembled contrarily betweeninside and out at a time of assembling the gasket 1 together with theconnector in the groove, the lug portion 3 is interfered with the baseand the assembly can not be finished. Accordingly, it is possible tonotice the erroneous assembly. The lug portion 3 is provided in the FPCside contact surface 7 of the gasket 1 in a flush manner as shown inFIG. 16B, however, may be sometimes arranged at a middle position in theheight direction (a lateral direction in the drawing) of the gasket 1 asshown in FIG. 5C.

Further, the lug portion 3 is provided as a tab for easily peeling thegasket 1 from the FPC. In other words, it is necessary that the gasket 1is attached to the side of the FPC for working at a time of detachingthe FPC from the base in the case of reworking as mentioned above,however, in the case that it is necessary to replace the gasket 1 due toa problem of the gasket 1 itself, it is hard to peel the gasket 1 fromthe FPC. The lug portion 3 is provided for easily peeling the gasket 1in the case mentioned above. The gasket 1 can be easily peeled from theside of the FPC by arranging a detachment facilitating portion 17constituted by the surface treated portion such as the matte finishingor the like in the FPC side contact surface 16 in the lug portion 3. Thedetachment facilitating portion 17 may be constituted by a recessportion, a convex portion or a combination thereof, in addition to thesurface treated portion such as the matte finishing or the like, and mayemploy any structures as far as the adhesive force per unit area is setto be smaller than that of the FPC side contact surface 7.

The attachment member specifying structures described in the first tofourth embodiments can be employed in the following parts in addition tothe connector gasket.

-   -   (1) Top cover gasket for HDD    -   (2) Gasket for general use or specific use other than use for        HDD    -   (3) Damping rubber for HDD    -   (4) Damping rubber for general use or specific use other than        use for HDD

Fifth Embodiment

FIGS. 17 and 18 show a VCM damper 21 serving as one kind of a dampingrubber corresponding to a rubber-like elastic part in accordance with afifth embodiment of the present invention, in which FIG. 17 is aperspective view of an attached state thereof, and FIG. 18 is a crosssectional view of the attached state thereof.

The VCM damper 21 in accordance with the embodiment is used so as to bepinched between a top cover 23 corresponding to a casing part of the HDD22 and a VCM 24 corresponding to an interior part of the HDD 22 withusing no adhesive agent, and achieves a damping effect so as to lower avibration generated at a time of actuating the VCM 24. An attachmentmember specifying structure is provided such that the VCM damper 21 issurely detached from one of the top cover 23 and the VCM 24 and isattached to the other (for example, detached from the top cover 23 andattached to the VCM 24) at a time of moving the top cover 23 and the VCM24 apart from each other (at a time of opening the top cover 23). Theattachment member specifying structure is concretely structured, forexample, by forming a contact area in the VCM damper 21 with respect tothe top cover 23 smaller than a contact area with respect to the VCM 24,forming a surface treated portion constituted by matte finishing or thelike on a contact surface in the VCM damper 21 with respect to the topcover 23, or forming a projection-like spring portion elasticallypressed to the top cover 23 so as to achieve a spring effect. Since theVCM damper 21 is generally formed in a flat plate shape as shown in FIG.19, it is preferable that a projection-like spring portion 25 is formedin a rib shape. In this case, the VCM 24 is structured such as to swingan arm 27 provided with a magnetic head 28 writing and reading the datawith respect to a magnetic disc 26.

EFFECT OF THE INVENTION AND INDUSTRIAL APPLICABILITY

The present invention achieves the following effects.

In the rubber-like elastic part in accordance with the first aspect ofthe present invention provided with the structure mentioned above, sincethe attachment member specifying structure is provided in therubber-like elastic part in such a manner that the rubber-like elasticpart is surely detached from one member and attached to the othermember, the rubber-like elastic part is surely detached from one memberand attached to the other member at a time of separating two members.Accordingly, it is possible to specify the member to which therubber-like elastic part is to attach, whereby it is possible to improvea workability and a working efficiency for the rework or the like.

Further, in the rubber-like elastic part in accordance with the secondaspect of the present invention provided with the structure mentionedabove, since the attachment member specifying structure is provided inthe rubber-like elastic part in such a manner that the rubber-likeelastic part is surely detached from one member and attached to theother member, and the attachment member specifying structure isstructured by forming the contact area in the rubber-like elastic partwith respect to one member smaller than the contact area with respect tothe other member, the rubber-like elastic part is surely detached fromone member and attached to the other member at a time of separating twomembers. Accordingly, it is possible to specify the member to which therubber-like elastic part is to attach, whereby it is possible to improvea workability and a working efficiency for the rework or the like.

Further, in the rubber-like elastic part in accordance with the thirdaspect of the present invention provided with the structure mentionedabove, since the attachment member specifying structure is provided inthe rubber-like elastic part in such a manner that the rubber-likeelastic part is surely detached from one member and attached to theother member, and the attachment member specifying structure isstructured by forming the surface treated portion constituted by thematte finishing or the like on the contact surface in the rubber-likeelastic part with respect to one member, the rubber-like elastic part issurely detached from one member and attached to the other member at atime of separating two members. Accordingly, it is possible to specifythe member to which the rubber-like elastic part is to attach, wherebyit is possible to improve a workability and a working efficiency for therework or the like.

Further, in the rubber-like elastic part in accordance with the fourthaspect of the present invention provided with the structure mentionedabove, since the attachment member specifying structure is provided inthe rubber-like elastic part in such a manner that the rubber-likeelastic part is surely detached from one member and attached to theother member, and the attachment member specifying structure isstructured by forming the projection-shaped spring portion elasticallypressed to one member so as to achieve the spring effect, therubber-like elastic part is surely detached from one member and attachedto the other member at a time of separating two members. Accordingly, itis possible to specify the member to which the rubber-like elastic partis to attach, whereby it is possible to improve a workability and aworking efficiency for the rework or the like.

Further, in addition to them, in the rubber-like elastic part inaccordance with the fifth aspect of the present invention provided withthe structure mentioned above, since the surface treated portion such asthe matte finishing or the like, or the detachment facilitating portionconstituted by the concavity and convexity or the like is provided inthe contact surface with the other member in the lug portion of therubber-like elastic member for the purpose of easily peeling therubber-like elastic part from the other member, the peeling work can beeasily executed at a time of peeling the rubber-like elastic part in astate of being attached to the other member from the other member.Accordingly, it is possible to specify the member to which therubber-like elastic part is to attach, and it is possible to facilitatethe peeling work, whereby it is possible to improve a workability and aworking efficiency for the rework or the like.

As mentioned above, the rubber-like elastic part in accordance with thepresent invention is used, for example, as the gasket or the gasket forHDD (the sixth aspect), as the damping rubber or the damping rubber forHDD (the seventh aspect), or as the rubber-like elastic part for HDD(the eighth aspect). However, with respect to the structure relevant tothe HDD, since no adhesive agent is used at a time of attaching, thereis no problem of the improper operation caused by the out gasgeneration.

1. A pinch structure of a rubber-like elastic part to pinch arubber-like elastic part between two members opposed to each otherwithout using any adhesive agent, wherein an attachment memberspecifying structure is provided in such a manner that said rubber-likeelastic part is surely detached from one member and attached to theother member at a time of detaching said two members.
 2. A pinchstructure of a rubber-like elastic part to pinch a rubber-like elasticpart between two members opposed to each other without using anyadhesive agent, wherein a contact area with one member in saidrubber-like elastic part is formed smaller than a contact area with theother member in such a manner that said rubber-like elastic part issurely detached from said one member and attached to said other memberat a time of detaching said two members.
 3. A pinch structure of arubber-like elastic part to pinch a rubber-like elastic part between twomembers opposed to each other without using any adhesive agent, whereina surface treated portion formed by matte finishing or the like isprovided in a contact area with one member in said rubber-like elasticpart in such a manner that said rubber-like elastic part is surelydetached from said one member and attached to the other member at a timeof detaching said two members.
 4. A pinch structure of a rubber-likeelastic part to pinch a rubber-like elastic part between two membersopposed to each other without using any adhesive agent, wherein aprojection-like spring portion elastically pressed to one member so asto achieve a spring effect is provided in such a manner that saidrubber-like elastic part is surely detached from said one member andattached to the other member at a time of detaching said two members. 5.A pinch structure of a rubber-like elastic part as claimed in claim 1,wherein a surface treated portion such as matte finishing or the like,or a detachment facilitating portion constituted by a concavity andconvexity or the like is provided in a contact surface with the othermember in a lug portion of said rubber-like elastic member in such amanner as to easily peel said rubber-like elastic part from the othermembers.
 6. A pinch structure of a rubber-like elastic part as claimedin claim 1, wherein said rubber-like elastic part is constituted to be agasket or a gasket for HDD.
 7. A pinch structure of a rubber-likeelastic part as claimed in claim 1, wherein said rubber-like elasticpart is constituted to be a damping rubber or a damping rubber for HDD.8. A pinch structure of a rubber-like elastic part as claimed in claim1, wherein said rubber-like elastic part is constituted to be arubber-like elastic part for HDD.